Star Fashion

Cyrus invests her extra cash in designer bags—like this one from Louis Vuitton—to dress up under-$20 frocks like her printed Wet Seal sundress. "When shopping for wardrobe updates on a budget, splurge on accessories and classic pieces," says Swennen. "A great bag is always worthwhile.

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Wet Seal tiered dress, $16.50; at wetseal.com.